This Hollywood movie is based on the case of the real Boston Strangler, who terrorized that city in the 60's. At first old women are being found strangled in their apartments. Then, then much younger women, including an African American. The police are baffled and have no clues so what they do is round up and harass all the 'sexual deviants' they have on file, thinking that he must be a homosexual because he hates women.It's not until halfway through the movie until we're introduced to the culprit, portrayed by Tony Curtis. He's married, has a family, and a job as a handyman. He'll be doing a job-and then gets the urge to kill, picking his victims at random. It's whoever is around that he sees at the moment.When he's finally captured by police they hold him at a psychiatric hospital because he insists that he didn't do the crimes, that he has no memory of them. The doctors and chief detective keep on questioning him and slowly he's able to remember that he indeed do the killings, which sends him into a catatonic state. He has a split personality and the evil one did the slayings. The movie is interesting because it makes you sympathetic to the serial killer and in the end you feel sorry for the guy, even though he did all these horrific deeds.